Not sure if this is a PHP problem or IIS7 issue:

My form is used for editing client information, and it has worked flawlessly for the last year until now. Some clients have more "Notes" about their file than others, and recently clients with a lot of "Notes" have been causing 404 Errors when trying to update their file.

I've already set my post_max_size to 50M, and my memory_limit is set to 128M.

My "Notes" column is set to BLOB (I've tried VarChar, Text, LongText, etc...), but to no avail.

BLOB columns don't have a max size, so I do not think this is a MySQL issue. There is no MySQL error displayed, instead, on form submission the page simply goes to a 404 "The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable."

This is running off of my own IIS7 Windows 2008 machine, which leads me to believe that there may be some server configuration that needs to be done. Any help is greatly appreciated.